You worked it.Get your Doughsky.
A flight recorder for a working musician's money. Put in the deal, clock in at the door, and at wrap get an invoice for what actually happened — with timestamped proof.
App Store $0.99
Overtime
Counted in your deal's units, rounded up. Scheduled overtime stays scheduled; the rest is caught.
Late downbeat
You were there at call time. The clock started then — stamped with where you were.
Doubles + cartage
One tap when you pick up another instrument or haul the kit.
Breaks
A countdown to the break you're owed, and the violation logged if it never comes.
Changes
"Stay 30 more" — typed or spoken, with who approved it.
Paid?
Numbered invoices, payments in, and who still owes you.